Advise on these paper stocks (worth anything?)

Hi, i have some paper stock that my grandfather left for us.
They are 80 papers and they are 35 years old.The name of the papers is UNION ZAIROISE DE BANQUES.

I searched on the net and found that this bank became bankrupt in 2006 and was merged into the Banque Congolaise.

Are these papers now worthless,any guess ?

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